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Modified bituminous composition for roof membranes

Inactive Publication Date: 2003-06-17
POLYPHALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The elastomers which may be used in the present invention have a conjugated diene structure and may vary from elastomeric polymers to elastomeric copolymers or thermoplastic elastomers. The elastomeric copolymers or thermoplastic elastomers. The elastomeric polymers may be those conjugated diene polymers selected among butadiene, isoprene and their functionalized polymers, such as those with halogenated or carboxylated groups. The elastomeric copolymers are thermoplastic elastomers or are conjugated diene based copolymers with another type of polymer, such as styrene and isobutylene. The copolymers may be a random or a block; di-sequenced; multi-sequenced, or a statistical copolymer. Suitable elastomers include NR, SBR, SB and SBS. The potential for compatibilizing these high molecular weight elastomers of widely varying properties in bituminous compositions is another primary advantage of the present invention.

Problems solved by technology

However, air-blown bitumens cannot cope with the demands of modern roofs: roofing felts need to last longer than ever and to be stable under the very varied conditions that exist worldwide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

This Example is an example of the process of the invention and of the compositions attainable thereby.

In this Example, the elastomer modifier used was a tri-block copolymer (SBS: Fina 411, a high molecular weight of star-type sequence SB connection structure). The cross-linking reagents selectively used were two different types of reagents, namely elemental sulfur and phenol-aldehyde resin (marketed by TexPar). The compositions and testing results are shown in Table I below.

The compositions were prepared using the following procedure: SBS was fully dispersed and mixed into bitumen using a Polytron mixer at a temperature range about 185.degree. C. for about 60 minutes. The cross-linking reagent was quickly dispersed into the elastomer dispersed bitumen mixture at a fixed amount, depending on the type of the reagent used (see formulations in Table I) and mixing was carried on for about 45 minutes. Then, the agitation was stopped and the temperature was maintained at above 150.degree. ...

example 2

This Example is an example of conventional elastomer modification of bitumen.

In this Example, the elastomer modifier used was the same type as in Example 1. The same cross-linking reagents from Example I were also used.

The compositions were prepared using the conventional procedure: SBS was dispersed, followed by addition of the reagent and mixed in bitumen at the same processing temperature using the Polytron mixer for about 1 or 2 hours. The process also involved the procedure based on the recent prior art using incremental loading technique of reagent and / or SBS at the same processing temperature using Polytron mixer for the same period of time.

The compositions or formulations and testing results are shown in Table II below.

The results set forth in Tables I and II show that acceptable performance in terms of softening point, (high temperature stiffness) and cold flexibility can be achieved at significantly lower polymer loadings than in the prior art, as demonstrated in the case ...

example 3

Modified bituminous roofing membranes have been prepared using the sulfur-reacted SBS-filler modified bitumen system, in which a polyester reinforcement mat (width / thickness: 100 mm / 1.4mm) is used as the carrier and the top ply of the membrane surfaced with slate granules. The SBS-filler modified binder was coated on the carrier at a rate of approximately 3,600 g / m.sup.2. The compositions and results of the roofing membranes set forth in Table III prove that acceptable performance in terms of softening point, flow resistance at 100C for 2 hours and cold bend temperature can be achieved at significantly lower polymer loading levels, in fact over 15% less polymer by wt. of the bitumen, as compared to conventional processing.

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Abstract

Roofing membranes are provided with both high stiffness at high temperature (greater than 110 ° C.) and good flexibility at low temperature (less than -20 ° C.). Bituminous compositions may be more effectively used in such membranes at lower elastomer concentration than currently practiced, using conventional cross-linking reagents to prepare the modified bituminous compositions with a range of viscosities that are readily processed as compared with conventional non-cross-linked systems.

Description

The present invention relates to waterproofing products, particularly elastomer-modified roof membranes using thermoplastic rubber (TR) modified bituminous compositions with an improved cost / performance balance.BACKGROUND TO THE INVENTIONBitumen is an excellent waterproofing material that has long been used in roofing applications. It is easy to apply and cheap. Roofing-grade bitumens (usually known as oxidized or `blown` bitumen) have been used successfully for more many decades.However, air-blown bitumens cannot cope with the demands of modern roofs: roofing felts need to last longer than ever and to be stable under the very varied conditions that exist worldwide. Modem roofs tend to be lighter than their predecessors, and better insulated, which widens even further the temperature range to which the surface is subject.Such demands triggered the introduction of bituminous roofing membranes modified with various polymers about 20 to 30 years ago. Although use of polymer-modified bi...

Claims

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Application Information

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IPC IPC(8): C08L95/00D06N5/00E04D5/00E04D5/02
CPCC08L95/00D06N5/00E04D5/02C08L53/00Y10T428/24405C08L2666/24
Inventor LIANG, ZHI ZHONGZHANG, YAN-PING
Owner POLYPHALT
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